diff --git a/gnu/packages/java.scm b/gnu/packages/java.scm
index 08ef7a8213..b2fddcc055 100644
--- a/gnu/packages/java.scm
+++ b/gnu/packages/java.scm
@@ -244,7 +244,8 @@ only faster.")
              "--disable-plugin"
              "--disable-dssi"
              "--disable-alsa"
-             "--disable-gjdoc")
+             "--disable-gjdoc"
+             "CFLAGS=-O0")
        #:phases
        (modify-phases %standard-phases
          ;; XXX: This introduces a memory leak as we remove a call to free up
@@ -333,7 +334,7 @@ other small VMs it supports the full spec, including object finalisation and
 JNI.")
     (license license:gpl2+)))
 
-(define ant-bootstrap
+(define-public ant-bootstrap
   (package
     (name "ant-bootstrap")
     ;; The 1.10.x series requires Java 8.  1.9.0 and later use generics, which